Resinous compound.



UNITED srarss PAFENT OFFICE.

DORRIS W'HIPPL E, 03 NEW YORK, N. Y., ASEJIGNGR TO STANDARD CHEMICAL COMPANY,

OF BAYONNE, NEW JERSEY, A CORPGRATIQN '91 NEW' JERSEY.

BESINOUS COMIEDUND.

No Drawing.

' To all whomit may concern Be it known that I, DORRIS Winrrmi, a citizen of the United States, residing at New York, in the county of New York and b State of New York, have invented new and useful Improvements in Resinous Conepounds, of which the following is,a specifi-- cation. r The invention relates to,a .ireW' resinous compound and to the recess of producing the same, the'product sing in the form of a sott,non-oxidizing, non-drying, permanently plastic mass of very high electrical resistivity which properties admirably adapt the same to the insulation of electrical cables and the like, and to various other uses, said processforming the basis of my copending application, Serial Nun'iber 526,660, filed of even date herewith.

in carrying out the process any resin which consists essentially of abictic anhydrid or abietic acid, preferably resin, is

placed in an iron still and heated to a temperature of approximately 135 0., which has the etlect, of course, ot' melting the rosin. While the rosin is still in molten condition, and not overheated, moist air, is

forced through the molten mass for the.

purpose of oxidizing the abietic acid of the rosin, and until the contents of the still shows a. high percentage of What is apparently tetra-oxyabietic acid. This time will, of course, probably vary with each particular batch of rosin treated, and can be rogu lated and determined by testing samples from time to time to ascertain the oxygen contents, as for example by treating a chloroform solution of the compound With iodin solution and titrating back the un combined iodiu, the proportion of i'odin consumed giving the percentage of rosin still left unchanged; or by subjecting the se lected specimens to electrical voltage or puncture tests; the conditions of the latter 5 being; that two hemispherical poles say c. in. in tllftll'ltrl'GI placed one tenth inch apart with a portion of the specimen filling the gap will require at least20,000 volts to show a puncture of the specimen; or, in the alternative, twenty sheets of-pure lvlanila paper, each six mils. gage, and previously saturated with the material, are placed between flat disks, compressed to a Working distance" of about one tenth inch and placed betweenthe terminals of a generator will Specification oi L tters Paten iateiited Dec. 30, 1913.

Application filed Hovcinber s, was. Serial No. 526,661.

not ruptured. punctured at a voltage less than 30,000 calculated on the mean square reading of a Thomson voltmeter.

The chemical changes which take place in the foregoing process cannot be definitely specified, but probably consist in the formation, from abietic anhydrid and abietic acid, oftetraoxyabietic acid, or more probably a compound thereof, by the combined action of the moisture and the oxygen introduced with the moist air, with the further possibility of many subsidiary com pounds being formed which are removed in the later oxidation process. The oxidation oi the ahietic oxid and ahietic anhydrid to produce the product, cannot be effected by air alone or by steam alone but only by the conjoint action of the two. A further ett'ect or" treating the molten rosin, at the term perature indicated, with a blast of moist air the elimination by oxidation, oi all the turpentine products and organic acids which may have been present in the originalrosin.

After the foregoing-operation has been conducted for the necessary period of time,

determincd by the tests, aforesaid, the compound in the still is preferably heated to a temperature of approximately 140 C. and dry air is passed through the same, for the purpose of expelling any uncombined watery vapor, resulting from the previous operation, and to effect a further oxidation of the abietic acid. During this latter stage of the process, great care and considerable slrill on the part of the operator is necessary in order to avoid an excessive oxi dation which would tend to carbonize the entire mass and render it unsuitable for the purpose for which it is intended. Too high temperature Will be evidenced by the coming over of comparatively large volumes of turpentine vapors, and as all such products in the original rosin. were eliminated by the first step of the process, their presence during' the second stage of the operation indicates their formation at the expense of the products resulting from the first step. Resulting from the last step mentioned is the final product, which may be best, defined by its peculiar physical characteristics and also by comparison with the rosin from which it is derived. The product is a soft gummy material, having a specific gravity of approximately )S, and which melts at a tem- "on: which it was spzirent or transluesii. a "lit turpentine ador, snows n definite mature when broken. specific grnviizy of resin is between 1.07 1.1 and it is, is Well llllClQlSiOO(l, sulcinle in nleeiinl, more r less soluble in pi 'ini sub .nee is a t.

'esin or resin. and the resulting prelim-l of the process, as described, are apparent. The

nlt-imns product may be further described as nnndrying, ineapzible of further ()Xltlillion under any circumstances urn-l (UlllllIlUlH of nirdinary use and retains ils softv and pin lie eenclition iinlefiniiely; it is free from 0:11-- bnnaceous pari'ii'ries, and cent-sins n0 rosin ail no pinsne derivatives and no volm'ile ergzinic eum spirits, viz. the petroleum series" Lasagna? Although the product finds many useful applications in the arts, its noIi-nXidiZin' and non-drying diameter, ils perfect an permanent pl; tiei'ty and its high specific eleeiricnl ZQJlEi'iillCQ fmzmr m Wit 38x10 me g elnns per cubic eentiniater which as winpzired with resin about to five in favor of the product, render it esmntially valuable an lZiSillilfiiIlf" nietiinm for eleciriczil cables, and it is in zliis particular field that the invention finds its widest application.

What I claim is:

1. The new compound herein. described, consisting essentially of resin ClfillfutlYQS in Lire form of a, soft, nondrying, non-oxidizing, permanently plastic mass, having a high electrical resistance factor.

2. The new compound herein described, cnnsisting esseniizilly of resin derivatives in the form (if a soft gummy mass, having a specific gravity 01" approximately 98 and which is non-drying and permanently plastic.

In imony whereof I have hereunto set my hand in presence of two subscribing wit- DORRIS WHIPPLE.

Yunnan I, ST. JOHN, HARRIE REESE. 

